docs: enhance documentation for _generateEventId function

[kazbekaskarov]

Enhanced documentation for the _generateEventId function:
Added a detailed description of parameters, return value, and usage examples.
Documentation now follows the JSDoc style and project guidelines.

Checklist:
Reviewed CONTRIBUTING.md.
No changes affecting the public API.
All existing tests are passing.
Change description matches required standards.

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Latest commit: 5eb0109

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